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.UNITED STATES JOHAN A. ZINN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO PATENT Ottica.

BEMENT, MILES at OO., OF SAME PLACE.

HYDRAULIC VALVE.

SPECIFICATION forming part of Letters Patent N0. 569,907, dated October 20, 1896. Application filed September 24, 1895. Serial No. 563,542. (No model.)

To all whom, t 71ml/ concer/t:

Be it known that I, JOHAN A. ZINN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Hydraulic Valves, of which the following is a specification.

The object of my invention is to simplify the construction of hydraulic valves, so that many of the parts may be in duplicate; and a further object of my invention is to provide a valve iu which all the packing is seated within the casing. These objects I attain in the following manner, reference being had to the accompanying drawings, in which- Figure l is a side View of my improved hydraulic valve, and Fig. 2 is a sectional View.

A is the casing, having the inlet-port a, the exhaust-port d2, and the port a/ to the machine to be operated.

A is the supply-chamber.

A2 is a chamber communicating with the port leading to the machine through the passage a3, and A3 is a chamber communicating with the exhaust-chamber A4. This chamber communicates with the port a through the exhaust-passage cui.

B is the piston-valve, having ports b b', which form a communication between the chambers A and A2, and the port-s b2 and b3, which form a communication between the chambers A3 and A4.

Adapted to a curved seat c in the casing A is a packing-ring e., U -shaped in cross-section, and pressing down upon this ring is a metallic follower-rin g I, having a tongue t', adapted to the U-shaped packing e.. Mounted above this ring I is a sleeve E, perforated to allowT for the passage of thev fluid into the valve, and this sleeve supports the ring I', being a duplicate of the ring I. This ring has a tongue t", which forces the packing e into a socket f, formed on the lower portion of the cage F. The upper end ot' this cage has a tongue f", which forces the packing-ring e2 into the seat formed in the cap C of the valve. The cage F is screw-threaded and is adapted to the screw-threaded opening in the cap.

Between the cap C and the valve-casing A is a packing-ring c', and the cap is held in place by nuts d d, adapted to threaded bolts CZ", projecting from the casing.

Seated in the lower portion of the valve is a ring I2, similar to the ring I, and this ring has a tongue t2, adapted to force the packing c3 into the seat f2 of the cage F, which is a duplicate of the cage F, and has a tongue f3, which contines the packing e4 against the seat formed in the cap C', which is held in place by screw-bolts and nuts similar to the cap O.

The cages F and F are screwed into their respective caps C C', and the packing e2 and e4 are thus confined in place. The other packing-rings are then adjusted in the casing and the caps applied. Thus it will be seen that by screwing down upon the cap C the packing-rings e and e are tightened, and by screwing upon the cap C' the ring e3 is tightened; and, further, it will be noticed that the caps C C are duplicates, as well as the cages F F and the rings I I I2. All the packingrings are alike. Consequently the valve can be made very cheaply and of few parts. Suitable nipples are provided for the supply-port ct and for the port to the machine, a', and the exhaust-port is coupled to the exhaust-pipe in the ordinary manner.

When the valve is in the position shown from the machine; but the exhaust is open from the machine, allowing the Huid to escape; but when the valve is raised so as to bring the port b up into the chamber A2 the fluid under pressure will pass from the chamber A into the chamber A2, through the passage cti to the machine, and both ports b2 and b3 will be in the chamber A3, and consequently the exhaust-port will be cut off from the machine.

'in Eig. 2, it will cut off fluid under pressure The valve is operated by a handled lever B in the usual manner, though it will be understood that it may be operated in any manner without departing from my invention. f

By the al' ovedescribed arrangement the packing-rings,\vhich are preferably of leather, are not exposed to the action of the liuid, except as the valve-stem is shifted. Then the pressure of fluid entering the ports of the valve-stem keeps the packing in place and clear of the ports, thus preventing wearing of the packing.

I claim as my inventionl. The combination in a hydraulic valve, of the casin g havin g supply and exhaust ports and a port to the machine, and having chambers therein, the chamber A' communicating with the supply-port, the chambers A2 and A3 communicating with the port to the machine, and the chamber A4 communicating with the exhaust-port, packing between the chambers, a piston-valve having two sets of port-s, one set forming communication between the chambers A and A2, and the other set forming communication between the chambers A3 and A1,substantially as specified.

2. The combination in a hydraulic valve, of the casing having chambers A', A2, A3 and Al formed therein, caps adapted to each end of the casing, packing-rings in the caps, cages,

y follower-rings and packing between the chambers, with a piston having ports therein, substantially as described.

3. The combination in a hydraulic valve, of the casing having the chamber A communicating with a supply-port, chambers A2 and A3 communicating with a port to the machine and an exhaust-chamber A4, packingrings e, e and e3, tongued followers t', c", 122 adapted to the packing-rings, cages F, F', and caps, substantially as described.

4. The combination of the casing Ahaving the chambers A', A2, A3 and A4, a packing ring e adapted to the seat in the casing, a follower t mounted on the ring, a sleeve E and a follower 7J' mounted on the sleeve, a packing e', a cage F adapted to receive the packing e and having a tongue adapted to packing e2, a cap C to which the cage is adapted, a ring I2 adapted to the opposite end of the casing, a packing-ring e3 adapted to said ring, a cage F', packing el, a cap C', with a piston-valve B having two sets of ports arranged substantially as described.

5. The combination in a hydraulic valve, of the casing, the piston-valve, ports therein, a cap for the casing, a cage screwed into the said cap, a packing-ring confined in the cap by the cage, said cage also coni ning a packing in the casing, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHAN A. ZINN. qWitnesses:

WILL. A. BARR, Jos. H. KLEIN. 

